metadata_exists

函数


metadata_exists ( $meta_type, $object_id, $meta_key )
参数
  • (string)
    $meta_type
    Type of object metadata is for. Accepts ‘post’, ‘comment’, ‘term’, ‘user’, or any other object type with an associated meta table.
    Required: 是
  • (int)
    $object_id
    ID of the object metadata is for.
    Required: 是
  • (string)
    $meta_key
    Metadata key.
    Required: 是
返回值
  • (bool) Whether a meta field with the given key exists.
定义位置
  • wp-includes/meta.php
    , line 734
引入
3.3.0
弃用
–

确定给定对象ID是否存在具有给定键的元字段。

function metadata_exists( $meta_type, $object_id, $meta_key ) {
	if ( ! $meta_type || ! is_numeric( $object_id ) ) {
		return false;
	}

	$object_id = absint( $object_id );
	if ( ! $object_id ) {
		return false;
	}

	/** This filter is documented in wp-includes/meta.php */
	$check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, true, $meta_type );
	if ( null !== $check ) {
		return (bool) $check;
	}

	$meta_cache = wp_cache_get( $object_id, $meta_type . '_meta' );

	if ( ! $meta_cache ) {
		$meta_cache = update_meta_cache( $meta_type, array( $object_id ) );
		$meta_cache = $meta_cache[ $object_id ];
	}

	if ( isset( $meta_cache[ $meta_key ] ) ) {
		return true;
	}

	return false;
}
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